Bush-hammer



(No Model.)

J. HOOD 8v S. H. REYNOLDS.

BUSH HAMMER.

No. 267,788. Patented Nov. 21, 1882.

I INVENTUli %J/ Q WITNESSES gzgflw the accompanying drawings, and to theletters and figures of reference marked thereon, which -In order toavoid these difficulties .we have UNiTED STATES PATENT OEFICE.

JOHN HOOD AND STEPHEN H. nnYnoLns, orBosToN; MAssAcHUsErrs.

BUSH-HAMMER.

SPECIFICATION forming part of Letters Patent No. 267,788, dated November21, 1882.

Application filed August 3, 1882. (No model.)

To all whom it may concern:

' Be it known that we, JOHN HOOD and STE- PHEN H. REYNOLDS, citizens ofthe United States, residing at Boston, in the county of Suflolk andState of Massachusetts, have invented certainnew and useful Improvementsin Bush-Hammers; and we do declare thefollowing to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to form a part of this specification.

This invention relates to an improvement in that class of stone-cutterstools commonly known as bush-hammers, and which are generallyconstructed by uniting two separate flat pieces of metal, called jaws(having a projecting central part which forms the eye for. the handle)by means of gibs, which have enlarged heads that clasp the edges of thejaws and form a base upon which the inner end of the series ofcuts orsteel blades that act upon the stone rest. These blades or cuts, as theyare technically called, are further secured in position between the jawsby bolts, which pass through both jaws and cuts and cause the jaws tofirmly clasp the cuts. The difficulty experienced with tools of thisconstruction arises from the fact that in use the inner ends of thehardened-steel plates which form the cuts soon wear into the gibs,which, as they have to be heated in order to putthemin place, are nothardened, thus causing the whole strain to come upon the bolts, whichsoon give out, and the tool is rendered useless until it is taken topieces and new gibs and bolts added.

constructed a bush-hammer in which the eye or handle-socket is aseparate and distinct block, which serves the purpose of a handlesocket, and. also, by means of recesses in its sides into which the jawsenter, fills the place of the gibs used to hold the jaws of the ordinarybush-hammer in position. As this eyeblock is a separate'and distinctpiece of steel, it may be hardened, so that the inner ends of the cutscannot wear it to any appreciable ex tent, thus saving the bolts whichunite the jaws from destructive wear, and causing the implement, asawhole, to possess much greater durability. I w

The invention may therefore be said to consist in the peculiarconstruction of the central block which forms the handle-socket, and inthe combinationand arrangement, in connection therewith, of the otherparts of the tool, as will be hereinafter described, and specificallysetforth in the claims.

Inthe accompanying drawings, Figure 1 is a perspective view of the toolcomplete. Flg. 2 is a sectional plan, the jaw being removed from oneside. Fig. 3 is a perspective view of the block which forms thehandle-socket. Fig. 4 is a similar view of one of the jaws, and Fig. 5shows one of the cuts removed from the tool.

A represents the handle-socket, which consists of a rectangular block ofsteel grooved or recessed on four sides, and. pierced by a hole, A,which is intended to recei e the handle. This socket, after receivingthe proper form, is preferably hardened, so as to bear the blows of thecuts without being quickly worn or upset, as it would he were it leftsoft or formed of iron. Thejaws B are also preferably made of steel, butdo not require hardening, as they are not exposed to the direct blowsot' the cuts, as are the blocks A. These jaws are provided with recessesb on each side, which embrace the projecting flanges a a of the block.An additional recess, B, is formed in the inner face of each jaw, whichreceives the broad surface of two sides of the block between the flangesac.

It will thus be seen that when the jaws are in place upon opposite sidesof the block the latter takes the place of the gibs in the. tool asordinarily constructed, holding thejaws firmly in place. Holes 0' c areformed in the opposite ends of the jaws for the passage of the bolts (1d, which,-when the parts are all in place, are passed through them, andserve to hold them firmly in their proper position with relation to eachother.'

The cuts 0 are rectangular plates of steel, having one side, 0, broughtto a comparativelysharp cutting-edge, and its opposite side providedwith a projecting tongue, 0, which enters the recess formed by theflanges upon the ends of the block A, thereby preventing lateraldisplacement. These cuts are also pierced with holes for the receptionof the bolts d d, by which they are firmly held between the 5 jaws andare prevented from being withdrawn therefrom. 'lhese cuts, after theyhave received the desired form, are properly tempered and are then readyfor use.

It will be seen that thejaws, as well as the cuts, are interchangeable,thus afl'ording' the greatest facility for repair, so that it anypartolthe tool should be broken it could immediately be replaced by anew piece, enabling the workman to always keep his tool in efiectivecondition without incurring the delay of sending it to the shop forrepair.

We are aware that bush-hammers have been heretofore constructed in whichthe/jaws and socket-block were formed of two pieces of metal, one-haltthe handle-orifice being made in. each piece and the two united bybolts. We

' are also aware that they have been constructed by forming thesocket-block and onejaw in a single piece, the otherjaw being movableand the two parts clamped together by bolts. We

do not therefore claim these methods of construction.

Having thus described our invention, we claim as new and desire tosecure by Letters Patent the following:

edges to receive the flanges thereof, all arranged in the manner shownand described.

3. The combination, in a bush-hammer, ot'

the socket-block surrounded at each end byv flanges a a, the recessedjaws embracing said block and its flanges, and the series of cuts 0 U,placed between thejaws, all the parts being held firmly in position bythe clamping-bolts d 01, substantially as and for the purpose set torth.

In testimony whereof we aflix our signatures in presence of twowitnesses.

JOHN HOOD. STEPHEN H. REYNOLDS.

Witnesses:

JOHN MAY, H. KEENAN.

